Ship&#39;s log



c. M. CHRISTENSEN.

SHIPS LOG.

APPLICATION HLED JULY 17.1920.

1,403,894. i Patented Jan. 17, 1922.

UNlTED STATES PATENT ,OFFICE.

SHIPS LOG.

To all whom it may concern:

Be it known that I, CHRIs'rEN M. CHRISTEN- SEN, a citizen of the United States, and resident of East Orange, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Ships Logs, of which the following is a specification.

This invention relates to improvements in ships logs. The object of the invention is to provide a generally improved ships log comprising such novel features and arrangements as are hereinafter set forth and pointed out in the appended claim.

The invention will be more fully understood from the following specification taken in connection with the accompanying drawing in which Figure 1 is a vertical partly broken away, mg my invention.

igure 2 is a view in elevation at right angle to the view shown in Figure 1 and with parts broken away.

Figure 3 is a transverse sectional view on line 3-3 of Figure 1. 4

Figure 4 is a diagrammatical transverse sectional view of a vessel showing the ships log in position.

Figure 5 is a fragmentary diagrammatical longitudinal View of the vessel with the ships log in position.

Referring to Figures 1, 2 and 3 my ships log comprises an indicator of any usual or suitable construction for iving the correct readings of the speed of tlie vessel. The indicator is mounted at the top of a tubular casing 11 which extends preferably from the wheel house 12, see Figures at and 5, and down through the vessel to the bottom 12 thereof. The bottom of the vessel 13 is apertured as at 16 so that the interior of the casing communicates with the outside of the vessel. The casing may be suitably sccured at the bottom as by a flange 15.

Within the casing 11 there is provided a weight 17 which is adapted to slide easily up and down in the casing. For the purpose of preventing lateral displacement of the weight within the casing, the latter and the weight are of a non-circular cross section as shown in Figure 3.

The weight is operable by means of a cable 18 which pases over a pulley 19 suitably mounted in the casing at 20. The free end of the cable may be fastened in any sectional View, of a ships log embody- I Specification of Letters Patent.

Application filed July 17,

Patented Jan. 17, 1922.

1920. Serial No. 396,929.

approved manner. The weight is not sus pended from the cable 18 but rests bv gravity on the inturned flange 21 at the bottom of the casing.

To the botom of the weight there is secured a bracket 22 in which is mounted a log propeller 23 which actuates the indicator operating rope or flexible shaft 24. by means of the bevel gears 25 and 26. The shaft 24 extends upwardly through the weight through a bore 27 therein and is connected to the indicator in the usual manner, not shown. 28 is the usual governor wheel on the shaft vided with a suitable door 29 whereby access may be had to the interior of the casing.

Referring to Figure 5 the numeral 30 denotes one of the main bulkheads in the vessel, as for instance the one between the cargo hold and the engine room. The casing 11 may be located with advantage adjacent the said bulkhead in order to avoid breakage.

During operation the speed of the vessel may be read directly by the oflicer in the wheel house, the indicator being operated in a well known manner by the propeller 23. The location of the propeller below the bottom of the ship renders it less liable to be come clogged by seaweed or for other reasons to become inoperative.

The formation of the casing and the weight insures the proper relationship between the propeller shaft and the vessel. For the purpose of repairing or inspection the weight with the propeller may be raised by means of the rope 18, access being had to the interior of the casing through the door 29. The casing may of course be constructed in any approved manner in sections or otherwise to facilitate installation and removal.

I claim A ships log comprising a vertically disposed tubular casing of non-circular cross section having an open bottom provided with inturned flanges, an indicating device mounted at the top of the said casing, a relatively long weight within the latter, said weight having a cross section corresponding to and fitting within the said tubular casing, a bracket secured to the bottom of the said weight and adapted to pass through the said open end of the said casing, a vertical and a horizontal shaft mounted in said bracket in permanent operating relationship, an indicator propeller mounted on said horizon;

24. The casing 11 is pro tal shaft, gears on said shafts for driving tel means for raising and lowering the said the said vertical shaft from the horizontal welght within the casing, said Weight being shaft, there being'a vertically disposedapep adapted 'toa-e'st-by t 'ravity on the flanges 10 ture formed in the said weight, a flexible aforesaid and a door in-said casing permitshaft passing through the said aperture and -ting access to the interior thereof.

connected to the said vertical shaft and the said indicating device for operating-the 1a CHRISTEN M. CHRISTENSEN. 

